Is APOB p.Ala3175Ser (c.9523G>T) pathogenic?

APOB p.Ala3175Ser (c.9523G>T) is classified Uncertain significance in APOB (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-08-27). AlphaMissense: likely benign (0.1578); Very rare (popmax 8.47e-05%, nfe).

How common is APOB p.Ala3175Ser (c.9523G>T) in the general population?

APOB p.Ala3175Ser (c.9523G>T) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

What do computational predictors say about APOB p.Ala3175Ser (c.9523G>T)?

AlphaMissense predicts likely benign (score 0.1578) — an in-silico prediction, not a clinical call.

APOB p.Ala3175Ser

c.9523G>T · VCV3392894

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.1578 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Missense predictors

0/2 damaging

AlphaMissense, REVEL

Computational evidence

Protein change
AlphaMissense	0.1578	likely benign
REVEL	0.165	moderately benign-leaning
⇒ AlphaMissense and REVEL both call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.54	GERP -2.4, phastCons 0.084
Regional constraint	o/e 1.03	unconstrained · MANE · 9,629 bp · p 0.051 · regional, not allelic
Overall
CADD	16.75	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,179,950 alleles

Overall 6.84e-05% 1/1,461,730 alleles · very rare

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: APOB
Protein: p.Ala3175Ser
Coding: c.9523G>T
MANE Select: NM_000384
Type: single nucleotide variant
Location: chr2:21007345 (GRCh38)
Gene constraint: LOEUF 0.537 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Residue 3175: the 'heparin-binding' region; the 'basic (possible receptor binding region)' region

Full APOB gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

APOB p.Ala3175= Likely benign ★ same residue
APOB p.Ala3175Pro Likely benign ★ ⚠ same residue
APOB p.Ala3175fs Pathogenic ★ same residue
APOB c.1830-1G>A Pathogenic ★★ same type
APOB c.2604+1G>A Likely pathogenic ★★ same type
APOB c.537+1G>T Pathogenic/Likely pathogenic ★★ same type
APOB p.Arg1333Ter Pathogenic ★★ same type
APOB p.Arg2012Ter Pathogenic ★★ same type

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/apob-p-ala3175ser (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown